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3 years ago

What must be present first in order for natural selection to occur???

2 answers:

6 0

Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. If they are met, natural selection automatically results.

Ur welcome

Scrat [10]3 years ago

3 0

In order for natural selection to occur there must be a change in the environment(I.e. natural disasters, predators, food source change, etc.) and then one of two things must happen: either all
Of the organisms die out in that population, or some survive and reproduce and all of the organisms have better suited traits for their environment

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In humans, Rh+ blood is dominant to Rh–. A man and woman are both Rh+, but their first child is Rh–.

shusha [124]

Answer:

<em> a) There is a 25% chance that their next child will be Rh-.</em>

<em>b) There is a 3/8 chance for a Rh+ girl</em>

Explanation:

As we know from the question that Rh is a dominant gene. A person having only one allele for the gene will show its effect as it is the dominant character.

This means that for a person to lack the Rh factor, it shall not have any allele with the Rh factor.

To illustrate the result, lets draw a punnet square:

Rh+ Rh-

Rh+ Rh+/Rh+ Rh+/Rh-

Rh- Rh+/Rh- Rh-/Rh-

For the probability for it to be a girl, we know that there are 50-50 chances for the next baby to be a boy or a girl. The chance of being Rh+ are 75% for the next baby.

Hence,

3/4 multiplied by 1/2 is 3/8 ,which is the chance for the next baby to be a girl with Rh+ factor.

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3 years ago

you have 2200 in your savings account each month you deposit 750 from your paycheck but you have to pay 350 and bills how many m

Papessa [141]

It would take 7 months because if you add 750 but subtract 359 you’re left with an addition 400 in your savings so multiple 400 by 7 and add 2200 to get 5000.

4 0

4 years ago

What impact does the various energy conversion processes have on ecology? energy conversion used by man usually produces polluti

ohaa [14]

It is related to natural cycles which affect activities of ecosystems

natural energy conversion can help maintain/ restore balance

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3 years ago

How does a cell of a unicellular organism differ from a cell of a multicellular organism?

Rzqust [24]

There is only one cell in a unicellular organism

3 0

3 years ago

Read 2 more answers

In pan mixia, in the absence of migration, mutation, and selection the frequencies are A) Constant in genotype and phenotype B)

muminat

Answer: option A - Constant in genotype and phenotype

Explanation:

Pan mixia is a situation in which an individual is just as likely to mate with another randomly chosen individual as any other in the population

In a situation as described in the question, sexual reproduction is limited to organisms of the same habitat, thus the genetic variation is reduced to the BAREST MINIMUM.

This results in Constancy in genotype and phenotype

6 0

4 years ago

What must be present first in order for natural selection to occur???​

What must be present first in order for natural selection to occur???